Question 1

rustix vs nix: which should I use for system programming in Rust?

Accepted Answer

rustix is better for I/O safety and configurable backends like linux_raw for performance, while nix is more established but may use raw file descriptors. Choose rustix for safety-focused projects or direct syscall optimization on Linux.

Question 2

How to enable the libc backend in rustix?

Accepted Answer

Enable the 'use-libc' Cargo feature or set the RUSTFLAGS environment variable to '--cfg=rustix_use_libc' during build. This switches from the default linux_raw backend to libc for portability across Unix-like systems and Windows networking.

Question 3

Does rustix support async I/O with io_uring?

Accepted Answer

Yes, rustix has an io_uring module gated by the 'io_uring' feature, providing safe wrappers for Linux's io_uring API. However, it's low-level and requires manual setup compared to higher-level async runtimes.

Question 4

What is the performance impact of using rustix compared to raw libc?

Accepted Answer

With the linux_raw backend, rustix often compiles to efficient, inlined code by avoiding libc overhead and using optimizations like vDSO for clock_gettime. The libc backend may have similar performance to direct libc calls but with added safety.

Question 5

Can rustix be used in no_std embedded projects?

Accepted Answer

Yes, by disabling the default 'std' feature, rustix supports no_std environments. However, some modules depend on alloc, so you may need to manage memory allocation separately.

Question 6

How does rustix handle year 2038 issues on 32-bit systems?

Accepted Answer

rustix automatically uses 64-bit APIs (e.g., fstatvfs64) even on 32-bit platforms, avoiding y2038 problems by ensuring timestamps and file sizes are represented correctly without developer intervention.

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